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    Wyświetlanie 1-13 z 13
    Tytuł:
    An Improved MSA Model for Evaluating the Sound Transmission Loss of a Rectangular Plate for Diffuse Field Incidence
    Autorzy:
    Kim, Myong-Jin
    Won, Kyong-Su
    Ri, Chol-Su
    Powiązania:
    https://bibliotekanauki.pl/articles/176309.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    transmission loss
    low frequency range
    natural vibration mode
    diffuse field incidence
    Opis:
    This paper presents an approximate analytical model for estimating the transmission loss (TL) of a finite rectangular plate in the low frequency range, which is based on the modal summation approach (MSA) taking into account the modal radiation impedance and fluid loading. The mode-dependent radiation resistance is calculated using the Rayleigh integral. The fluid loading is taken into account through the natural frequency modified by the added mass. The results are compared with the ones of Statistical Energy Analysis (SEA) coupled with FEM and FEM coupled with BEM. In addition, the effects of the various vibration modes and the fluid loading on TL, and a way for reducing the calculation time are discussed.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 259-265
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Influencing Factors of the Acoustic Performance of the Muffler Considering Acoustic-structural Coupling
    Autorzy:
    Zhao, Bo
    Li, He
    Powiązania:
    https://bibliotekanauki.pl/articles/31339942.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic performance
    muffler
    acoustic-structural coupling
    transmission loss
    mode
    optimisation
    Opis:
    In the calculation of the acoustic performance of mufflers, the walls of mufflers are usually treated rigidly without considering the acoustic-structural coupling, but the results so calculated differ significantly from the actual situation. Based on the basic equations, the article derives the finite element equations of the muffler system while considering the acoustic-structural coupling effect and theoretically analyses the connection between the acoustic-structural coupling system and the structural and acoustic modes. The structural and acoustic modes of the muffler are calculated and the reasons for the mutation of the transmission loss curve of the muffler when the acoustic-structural coupling is considered are analysed. The results show that the acoustic-structural coupling is the result of the interaction between the structure and the air inside the expansion chamber under acoustic excitation, which manifests mutations in the sound pressure inside the muffler in some frequency bands. Then, using a single-chamber muffler as an example, the transmission loss is used to characterise the performance of the muffler. The effects of different factors such as shell thickness, structure, porous media material lining, and restraint method on the acoustic-structural coupling effect of the muffler are analysed, and the structure of a double-chamber muffler is successfully optimised according to the conclusions.
    Źródło:
    Archives of Acoustics; 2022, 47, 4; 479-490
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of spread spectrum transmission in the aspect of radio communications security
    Zastosowanie transmisji z widmem rozproszonym w aspekcie bezpieczeństwa łączności radiowej
    Autorzy:
    Król, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/30145370.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    communication security
    operating mode
    radio communications
    Polish Armed Forces
    frequency hopping
    FH
    SINCGARS
    HAVE QUICK
    narrow band hopping
    broadband hopping
    bezpieczeństwo łączności
    tryb pracy
    łączność radiowa
    Polskie Siły Zbrojne
    hopping wąskopasmowy
    hopping szerokopasmowy
    Opis:
    This publication considers the use of spread spectrum transmissions in the aspect of threats to radio communications security. Numerous restrictions related to the previous use of specific operating modes of VHF, UHF and KF radio stations with reference to the possibilities of counteracting on the part of a potential enemy using the most modern EW (electronic warfare) systems, as well as those based on the procedures of the Russian Federation Armed Forces.
    W niniejszej publikacji poddano pod rozwagę wykorzystanie transmisji z widmem rozproszonym w aspekcie zagrożeń bezpieczeństwa łączności radiowej. Wskazano na liczne ograniczenia związane z dotychczasowym wykorzystywaniem określonych trybów pracy radiostacji VHF, UHF oraz KF w odniesieniu do możliwości przeciwdziałania ze strony potencjalnego przeciwnika wykorzystującego najnowocześniejsze systemy WRE, a także bazujące na procedurach SZ Federacji Rosyjskiej.
    Źródło:
    Scientific Journal of the Military University of Land Forces; 2020, 52, 1(195); 121-134
    2544-7122
    2545-0719
    Pojawia się w:
    Scientific Journal of the Military University of Land Forces
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of unscented Kalman filter for clutch position control of automated manual transmission
    Autorzy:
    Soltani, Abbas
    Arianfard, Milad
    Jazar, Reza Nakhaie
    Powiązania:
    https://bibliotekanauki.pl/articles/2172774.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    automated clutch
    actuator
    adaptive sliding mode control
    estimator
    unscented Kalman
    filter
    automatyczne sprzęgło
    sterowanie trybem ślizgowym
    taksator
    Kalman
    filtr
    Opis:
    In this paper, an adaptive sliding mode controller (ASMC) is proposed for an electromechanical clutch position control system to apply in the automated manual transmission. Transmission systems undergo changes in parameters with respect to the wide range of driving condition, such as changing in friction coefficient of clutch disc and stiffness of diaphragm spring, hence, an adaptive robust control method is required to guarantee system stability and overcome the uncertainties and disturbances. As the majority of transmission dynamics variables cannot be measured in a cost-efficient way, a non-linear estimator based on unscented Kalman filter (UKF) is designed to estimate the state valuables of the system. Also, a non-linear dynamic model of the electromechanical actuator is presented for the automated clutch system. The model is validated with experimental test results. Numerical simulation of a reference input for clutch bearing displacement is performed in computer simulation to evaluate the performance of controller and estimator. The results demonstrate the high effectiveness of the proposed controller against the conventional sliding mode controller to track precisely the desired trajectories.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 2; 319--339
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-voltage analog switches with current-mode control
    Autorzy:
    Jankowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/398047.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    komutator analogowy
    sterowanie ze sprzężeniem prądowym
    przesył prądu
    przesył napięcia
    high-voltage circuits analog switches
    current-mode control
    current transmission
    voltage transmission
    Opis:
    The paper presents a number of high-voltage analog switch designs. All of them are current-controlled designs, which make them well prepared to operation in presence of high voltage drops of transmitted signals. Possible application areas for presented structures are discussed.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2011, 2, 1; 17-21
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of dynamic processes in gas transmission
    Autorzy:
    Prytula, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/411157.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    transmission system
    compressor station
    optimal operating mode
    gas flow model
    network model
    piping diagram
    finite element method
    Opis:
    The problem of finding the parameters of the gas transmission system in terms of its operations under unsteady operating modes are considered. We show mathematical models of gas flows in the basic facilities in the system with a complicated piping diagram. The solution is built to solve a system of partial differentia equations with the finite element method of large dimension with boundary conditions, some of which are designed in the process of solving the system of equations. This is due to the provision of technical and technological constraints on the pressure of the controlled points of the system. On the resistance to finding a solution significantly affects a step of the time coordinate. The proposed algorithm in the editing process of flow diagrams provides an increase in stability of solving systems of equations, and significantly reduces the time for the simulation.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 3; 57-63
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment for SVD-assisted Downlink Multiuser MIMO Transmission Schemes with Iterative Detection
    Autorzy:
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226541.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    singular value decomposition
    bit allocation
    power allocation
    wireless transmission
    multiuser transmission
    Opis:
    Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO systems have attracted a lot of attention for both frequency and non-frequency selective channels and reached a state of maturity. By contrast, MIMO-aided multiple-user systems require substantial further research. In comparison to zero-forcing (ZF) multiuser transmission techniques, where all users are treated jointly, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO solution takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 127-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM Systems
    Autorzy:
    Aust, S.
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/227057.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    orthogonal frequency division multiplexing
    singular value decomposition
    bit allocation
    wireless transmission
    Opis:
    Multicarrier transmission such as OFDM (orthogonal frequency division multiplexing) is an established technique for radio transmission systems and it can be considered as a promising approach for next generation wireless systems. However, in order to comply with the demand on increasing available data rates in particular in wireless technologies, systems with multiple transmit and receive antennas, also called MIMO (multiple-input multiple-output) systems, have become indispensable for future generations of wireless systems. Due to the strongly increasing demand in high-data rate transmission systems, frequency non-selective MIMO links have reached a state of maturity and frequency selective MIMO links are in the focus of interest. In this field, the combination of MIMO transmission and OFDM can be considered as an essential part of fulfilling the requirements of future generations of wireless systems. However, single-user scenarios have reached a state of maturity. By contrast multiple users' scenarios require substantial further research, where in comparison to ZF (zero-forcing) multiuser transmission techniques, the individual user's channel characteristics are taken into consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier shows that not necessarily all user-specific MIMO layers per subcarrier have to be activated in order to minimize the overall BER under the constraint of a given fixed data throughput.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 459-464
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Narrow transmission mode in one-dimensional symmetric defective photonic crystal containing metamaterial and high Tc superconductor
    Autorzy:
    Srivastava, Sanjeev K.
    Aghajamali, Alireza
    Powiązania:
    https://bibliotekanauki.pl/articles/173630.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    photonic band gap
    transmission spectra
    transmission mode
    defect mode
    metamaterial
    negative index material
    superconductor photonic crystal
    Opis:
    We theoretically investigate the properties of narrow transmission mode (defect mode) within the reflection band in one-dimensional symmetric defective photonic crystal containing double negative metamaterial and high temperature superconductors. The transmittance spectrum of the proposed structure is obtained by using the characteristic or transfer matrix method. The results show that by increasing the thickness of air defect, transmission mode shifts towards the lower frequency side. But when the thickness of a superconductor layer is increased, transmission mode shifts towards the high frequency side. Further, the effect of temperature variation of superconducting defect on the defect mode has been investigated and found that when the temperature of superconducting layer increases the frequency of defect mode is red shifted. The shift in frequency has smaller value in the lower temperature region than in the higher temperature region, even if the change in temperature is same. Finally we have discussed the effect of variation of thickness on the defect mode by using the double negative metamaterial as defect layer in place of superconductor layer. The result shows that we get two modes for smaller thickness of double negative layer but only a single mode for larger thickness.
    Źródło:
    Optica Applicata; 2019, 49, 1; 37-50
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent advances in mode converters for a mode division multiplex transmission system
    Autorzy:
    Memon, A. K.
    Chen, K. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818205.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    integrated optical device
    mode converters
    mode division multiplex
    optical waveguide
    Opis:
    Adopting mode division multiplex (MDM) technology as the next frontier for optical fiber communication and on-chip optical interconnection systems is becoming very promising because of those remarkable experimental results based on MDM technology to enhance capacity of optical transmission and, hence, making MDM technology an attractive research field. Consequently, in recent years the large number of new optical devices used to control modes, for example, mode converters, mode filters, mode (de)multiplexers, and mode-selective switches, have been developed for MDM applications. This paper presents a review on the recent advances on mode converters, a key component usually used to convert a fundamental mode into a selected high-order mode, and vice versa, at the transmitting and receiving ends in the MDM transmission system. This review focuses on the mode converters based on planar light wave circuit (PLC) technology and various PLC-based mode converters applied to the above two systems and realized with different materials, structures, and technologies. The basic principles and performances of these mode converters are summarized.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 13--32
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust Flow Controllers for a Single Virtual Circuit in Data Transmission Networks with Lossy Links
    Autorzy:
    Bartoszewicz, A.
    Leśniewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/108780.pdf
    Data publikacji:
    2012
    Wydawca:
    Społeczna Akademia Nauk w Łodzi
    Tematy:
    data transmission networks
    congestion control
    sliding-mode control
    discrete-time systems
    Opis:
    The paper concerns an application of regulation theory methods to modeling and effective control of connection-oriented data transmission networks. In particular the problem of congestion control in a single virtual circuit of such a network is considered and new discrete-time sliding mode data flow rate controllers are proposed. The controllers are designed in such a way that packet losses are explicitly accounted for. The closed-loop system stability and finitetime error convergence are proved. Moreover, a number of favorable properties of the proposed controllers are stated as theorems, formally proved and verified in a simulation example. It is demonstrated that the proposed controllers guarantee full utilization of the available bandwidth and eliminates the risk of bottleneck node buffer overflow. Application of time-varying sliding hyperplanes helps avoid excessive transmission rates at the beginning of the control process.
    Źródło:
    Journal of Applied Computer Science Methods; 2012, 4 No. 1; 5-20
    1689-9636
    Pojawia się w:
    Journal of Applied Computer Science Methods
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The secure transmission protocol of sensor Ad Hoc network
    Bezpieczny protokół transmisji sensorowej sieci Ad Hoc
    Autorzy:
    Marczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/955994.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    TDMA
    ad hoc
    ASAP
    OFB Mode
    Opis:
    The paper presents a secure protocol of radio Ad Hoc sensor network. This network operates based on TDMA multiple access method. Transmission rate on the radio channel is 57.6 kbps. The paper presents the construction of frames, types of packets and procedures for the authentication, assignment of time slots available to the node, releasing assigned slots and slots assignment conflict detection.
    W artykule zaprezentowano bezpieczny protokół radiowej sieci sensorowej Ad Hoc. Sieć ta pracuje w oparciu o metodę wielodostępu TDMA. Szybkość transmisji w kanale radiowym wynosi 57,6 kb/s. Przedstawiono budowę ramek, rodzaje pakietów oraz procedury uwierzytelniania, przypisania wolnych szczelin czasowych do węzła, zwalniania przypisanych szczelin i wykrywania konfliktów przyporządkowania szczelin.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2015, R. 56 nr 4 (203), 4 (203); 27-39
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zniszczenie słupów elektroenergetycznych jako jedna z przyczyn blackoutu szczecińskiego 2008
    Autorzy:
    Paczkowska, T.
    Paczkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/162043.pdf
    Data publikacji:
    2010
    Wydawca:
    Polski Związek Inżynierów i Techników Budownictwa
    Tematy:
    katastrofa energetyczna
    słup elektroenergetyczny
    awaria mechaniczna
    mechanizm zniszczenia
    energetic catastrophe
    overhead transmission line support
    mechanical failure
    mode of failure
    Źródło:
    Przegląd Budowlany; 2010, R. 81, nr 5, 5; 23-26
    0033-2038
    Pojawia się w:
    Przegląd Budowlany
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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